chore(examples): migrate vue examples to vite

[Haroenv]

Summary

Migrate the "regular" Vue CLI examples to use Vite instead. I didn't touch the server side rendering or Nuxt example, so this doesn't yet remove any dependency.

Result

• "regular" Vue examples use Vite, no longer vue-cli, and therefore are no longer built with Webpack.
• "specs" Astro site is updated (so same esbuild version is used)
• not changed: Nuxt example, Vue server side rendering example (both still using webpack)

[Haroenv]

Unfortunately this is blocked as Astro 4 requires node 18.14+ and the latest version configurable on codesandbox CI is 18.12 😢 (cc @CompuIves)